Allow features to refer to subkeys in _manifest_features.json.

chrome/common/extensions/docs/samples.json

Index: chrome/common/extensions/docs/samples.json
diff --git a/chrome/common/extensions/docs/samples.json b/chrome/common/extensions/docs/samples.json
index 08d230959bffd8e79c3ec079729cb11041b5a443..d2feeecb07019987a6e9ccdccd51a0f21cb5b9bb 100644
--- a/chrome/common/extensions/docs/samples.json
+++ b/chrome/common/extensions/docs/samples.json
@@ -160,12 +160,15 @@
     "chrome.experimental.serial.open": "experimental.serial.html#method-open",
     "chrome.experimental.serial.read": "experimental.serial.html#method-read",
     "chrome.experimental.serial.write": "experimental.serial.html#method-write",
+    "chrome.experimental.socket.bind": "experimental.socket.html#method-bind",
     "chrome.experimental.socket.connect": "experimental.socket.html#method-connect",
     "chrome.experimental.socket.create": "experimental.socket.html#method-create",
     "chrome.experimental.socket.destroy": "experimental.socket.html#method-destroy",
     "chrome.experimental.socket.disconnect": "experimental.socket.html#method-disconnect",
     "chrome.experimental.socket.onEvent": "experimental.socket.html#event-onEvent",
     "chrome.experimental.socket.read": "experimental.socket.html#method-read",
+    "chrome.experimental.socket.recvFrom": "experimental.socket.html#method-recvFrom",
+    "chrome.experimental.socket.sendTo": "experimental.socket.html#method-sendTo",
     "chrome.experimental.socket.write": "experimental.socket.html#method-write",
     "chrome.experimental.speechInput.isRecording": "experimental.speechInput.html#method-isRecording",
     "chrome.experimental.speechInput.onError": "experimental.speechInput.html#event-onError",
@@ -2521,7 +2524,7 @@
         "content.js",
         "manifest.json"
       ],
-      "source_hash": "82ef52e9b8c34ec7d30f6524e7bafec0be655c27",
+      "source_hash": "6d52786858ac8c46aad6fe09754d1f44a6fc888a",
       "zip_path": "examples\/api\/transientPage\/basic.zip"
     },
     {